On shift: MN, FM, PR             08:00 - 16:00

Logbook 8 pages 18-23

Ecm = 3523.5 MeV

Run 5757  (inherited)   330.5 nb-1
Run 5758                138.3 nb-1
Run 5748  (in progress) 

Ibeam at start : 39.0 mA       Ibeam at end :  34.6 mA

Typical sigmaP: 1.7-2.0 MeV/c

Comments: 

08:45 some of the scaler rates are found to be lower than they used to be
      (e.g. May 17). In particular Etot80% (-35%), Etot70% (-28%) and
      GM1 (-10%).
09:30 during the last 1/2 an hour we've observed twice a net decreasing of
      the trigger and logging rates (lasting a few minutes). This is 
      probably due to fibers, but it didn't last enough to let us
      investigate. Anyway it has not occurred again.
09:58 Steve Werkema calls from MCR and asks us to turn the jet off
      because of beam instability. Run 5758 paused.
10:55 Jet on and density slowly raised, the beam is still unstable.
      Anyway data taking is resumed.
11:55 MCR called to say that there is a cold water leakage. It also
      affects our conditioning.
12:08 Werkema asks us to turn off the target again because of problems
      with the cooling system. Run 5758 first paused and then stopped at
      12:30.
13:50 Werkema says to turn slowly on the target. We are now taking data at
      a lower luminosity (2 x 10^31 cm^-2 s^-1) to avoid the beam
      instability.


Matteo, Flavio and Paolo